An orbital wave function is written as product of Radial function and Angular function. The Radial wave function depends upon n and l quantum number, and Angular wave function depends upon l and ml quantum number.
ψ = R(r).A(θ,Φ)
Radial function depicts the size of the orbital and angular function determines the orientation of lobes of orbital. Node is a region where, probability of finding an electron is zero. So, Radial node is the point where,
ψ = A(θ,Φ) for all R and it can be shown as
and Angular node is the point where,
ψ = R(r) for all A and it can be shown as
Note: The points which meet the axis are nodal points.
Hope this information is helpful.